yo Brewster on Birds from Arizona and New Mexico. 



Dimensions. "Length, 10.20: stretch, 19.40" (collector's 

 measurements) ; wing, 6.65 : tail. 4.45 ; tarsus, .73 ; longest, ric- 

 tal bristle, 1 .So. 



Habitat. Chiracahua Mountains. Arizona. 



The differential characters presented by this specimen, are, in 

 my opinion, well worthy of varietal recognition. My collection 

 embraces a very good suite of eastern specimens of vociferus, 

 and among them I rind no decided approaches to the Arizona bird. 

 The white on the tail, although somewhat variable in extent, is 

 never limited to so small an area, and the rictal bristles are inva- 

 riably much shorter. Nor have I seen any eastern males with the 

 gular collar uniformly ochraceous, even autumnal examples hav- 

 ing the white largel) predominating over this space. The dif- 

 ference in size also is very considerable. Taking the wing as the 

 best exponent of this, the wing of arizonce gives 6.65, while 

 seven males of vociferus measure respectivel) 5.80; 5.80; 5.S3 : 

 5.96 ; 6.20 : (1.2 1 : 6.40. 



I am indebted to my friend Mr Ridgway, for an opportunity of 

 examining a male and female of the Mexican species A. ma- 

 cromystax. from the collection of the National Museum. These 

 specimens differ so which from m\ arizonce that a comparison 

 between them and the latter, is scarcely necessary. Arizonce 

 has the white of the tail deepest on the inner feathers and decreas- 

 ing in extent towards the outer pair, precisely as with vociferus; 

 while in macromystax the white areas decrease very rapidly in- 

 wards, the third pair of rectrices being barely tipped with that 

 color. Furthermore, macromystax has the hill longer and much 

 more compressed; the nostrils larger and more prominent; the 

 rictal bristles thicker ; the feet and tarsi stouter, and <///// orange 

 in color ; the general plumage much darker ; the under parts with 

 broad but sparsely scattered blotches of fulvous white ; and the 

 decided abdominal zone of light color wanting. 



With the pair of A. macromystax Mr. Ridgwa\ also sends me 

 lour examples of vociferus, from Mexico and Gautemala. Only 

 one of these bears any date ( Tehuantepec City, Nov. 2. 1869), 

 but two of the others are apparently winter specimens also, and 

 as all three agree perfectly with my autumnal specimens of voci- 

 ferus taken in New England. I regard them as winter visitors 

 from the eastern United States. The fourth, however, (No. 

 74.35s- National Museum) from Guanajuato, Mexico, shows an 



